Robert Putnam (of Bowling Alone fame) is apparently nervous about releasing his new study because he fears it will be hijacked by anti-immigration folks. I can see why:

Putnam’s study reveals that immigration and diversity not only reduce social capital between ethnic groups, but also within the groups themselves. Trust, even for members of one’s own race, is lower, altruism and community cooperation rarer, friendships fewer. The problem isn’t ethnic conflict or troubled racial relations, but withdrawal and isolation. Putnam writes: “In colloquial language, people living in ethnically diverse settings appear to ‘hunker down’—that is, to pull in like a turtle.”

In the 41 sites Putnam studied in the U.S., he found that the more diverse the neighborhood, the less residents trust neighbors. This proved true in communities large and small, from big cities like Los Angeles, Chicago, Houston, and Boston to tiny Yakima, Washington, rural South Dakota, and the mountains of West Virginia. In diverse San Francisco and Los Angeles, about 30 percent of people say that they trust neighbors a lot. In ethnically homogeneous communities in the Dakotas, the figure is 70 percent to 80 percent.

Diversity does not produce “bad race relations,” Putnam says. Rather, people in diverse communities tend “to withdraw even from close friends, to expect the worst from their community and its leaders, to volunteer less, give less to charity and work on community projects less often, to register to vote less, to agitate for social reform more, but have less faith that they can actually make a difference, and to huddle unhappily in front of the television.” Putnam adds a crushing footnote: his findings “may underestimate the real effect of diversity on social withdrawal.”

Neither age nor disparities of wealth explain this result. “Americans raised in the 1970s,” he writes, “seem fully as unnerved by diversity as those raised in the 1920s.” And the “hunkering down” occurred no matter whether the communities were relatively egalitarian or showed great differences in personal income. Even when communities are equally poor or rich, equally safe or crime-ridden, diversity correlates with less trust of neighbors, lower confidence in local politicians and news media, less charitable giving and volunteering, fewer close friends, and less happiness.

Rod Dreher comments: "I predict this research will have absolutely zero impact on the immigration debate. Why? Because Diversity is a dogmatic secular religion."